Foldable box spring



FIG. 1 is a front perspective view of a foldable box spring;

FIG. 2 is front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a light side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is an exploded view thereof.

The broken lines depict exemplary environment and components forpurposes of illustration and form no part of the design claim.

CLAIM The ornamental design for a foldable box spring, as shown anddescribed.